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Tire temps drop fast, even one turn to a next they can change pretty dramatically. We had live IR temp probes looking at wheels on our FSAE car for test and tune. Not our car, but same idea: http://sine.ni.com/cs/app/doc/p/id/cs-722#

An IR probe measures the surface temp though. I know that changes very quickly, but the pokey probe that goes in gets a better idea of what went on all session long. Again, never checked balls hot without a cooldown lap. One of those things I always forget about and never seem to have a body around to do for me.

Every time I've probed my RRs they're in the 140s, even post Hallett final. Granted I probe them back in the pits when I get out of the car and not trackside, but still I never get them as hot as Toyo recommends unless my probe sucks?

Dude you are wasting your time probing tires or checking pressures in the pits.